Anyone know a cheap source of a DID number that can be diverted to SIP
addresses ?
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On Sun, 05 Mar 2006 21:50:12 GMT, Brian A
<no_spam_bca1000@hotmail.com> wrote:

>Anyone know a cheap source of a DID number that can be diverted to SIP
>addresses ?
I meant to say UK GEOGRAPHIC DID number.


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Brian A wrote:
> Anyone know a cheap source of a DID number that can be diverted to SIP
> addresses ?

Define cheap.

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Brian A wrote:
> Anyone know a cheap source of a DID number that can be diverted to SIP
> addresses ?

Generally, you'll find that most providers worth their salt won't
redirect to sip address. Mostly because this could be used (depending
on the platform that's implemented) to create a denial of service on
the server, either intentionally or unintentionally.

Calls could be:

- inadvertantly bounced between supliers
- sent to an unroutable address
- sent to an address (sip:a@b.com) that redirects to another address
(sip:b@a.com) that redirects to the first address (sip:a@b.com), ergo,
routing loop.
- plethora of other examples.

If someone were to flood that number with calls, the services could
easily overload or run out of memory or whatever, since it can be
paticularly difficult to filter these calls[1].

There may be one or two suppliers though. I can't quote any off the top
of my head.

~ Rich

[1] Some providers remove SIP headers in order to hide infrastructure.

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"Brian A" <no_spam_bca1000@hotmail.com> wrote in message
 news:s9nm0257107pf1lo28cc3jaq0vs23iqnsj@
4ax.com
> On Sun, 05 Mar 2006 21:50:12 GMT, Brian A
> <no_spam_bca1000@hotmail.com> wrote:
> 
> I meant to say UK GEOGRAPHIC DID number.

www.ipkall.com provide free US numbers (and very good they are too..!),
but I can't think of a UK equivalent offhand.

Ivor

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"Richard Smith" <pobkuk@gmail.com> wrote in message
news:1141697719.391860.122520@e56g2000cwe.googlegroups.com...
> Brian A wrote: 
>
> Generally, you'll find that most providers worth their salt won't
> redirect to sip address. Mostly because this could be used (depending
> on the platform that's implemented) to create a denial of service on
> the server, either intentionally or unintentionally.
>
> ...

Am I missing something. I thought the OP was asking for a source of UK
numbers which could be assigned to a SIP phone/device - like Sipgate,
Gradwell and countless other UK suppliers do.

--
Thomas Sandford

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"Thomas Sandford" <${thomas/03$}@paradisegreen.co.uk> wrote
in message news:440d684d$0$1174$5a6aecb4@news.aaisp.net.uk
> "Richard Smith" <pobkuk@gmail.com> wrote in message
> news:1141697719.391860.122520@e56g2000cwe.googlegroups.com... 
>
> Am I missing something. I thought the OP was asking for a
> source of UK numbers which could be assigned to a SIP
> phone/device - like Sipgate, Gradwell and countless other
> UK suppliers do.

He said SIP *address* not SIP device. I read it as a number that could be
directed to an *existing* SIP address.

www.ipkall.com do this for US phone numbers, but I can't think of a UK
equivalent offhand.

Ivor

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Richard Smith wrote:
> Brian A wrote: 
>
> Generally, you'll find that most providers worth their salt won't
> redirect to sip address. Mostly because this could be used (depending
> on the platform that's implemented) to create a denial of service on
> the server, either intentionally or unintentionally.
>
> Calls could be:
>
>  - inadvertantly bounced between supliers

Can be done with PSTN, what's special about doing it with VoIP?

>  - sent to an unroutable address

I'm fairly sure you can do this with PSTN.

>  - sent to an address (sip:a@b.com) that redirects to another address
> (sip:b@a.com) that redirects to the first address (sip:a@b.com), ergo,
> routing loop.

You can do this with PSTN.

>  - plethora of other examples.

Any which are "impossible" to do on PSTN, or which otherwise make VoIP
special?

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"Ivor Jones" <ivor@despammed.invalid> wrote in message
news:475bbmFdooa3U1@individual.net...
>
>
> "Thomas Sandford" <${thomas/03$}@paradisegreen.co.uk> wrote
> in message news:440d684d$0$1174$5a6aecb4@news.aaisp.net.uk 
>
> He said SIP *address* not SIP device. I read it as a number that could be
> directed to an *existing* SIP address.
>
> www.ipkall.com do this for US phone numbers, but I can't think of a UK
> equivalent offhand.

Ah - right - I do see the distinction (though I'm not convinced that the OP
wasn't asking the wring question in that case!). Gradwell _do_ provide the
type of forwarding you refer to:

http://www.gradwell.com/voip/asterisk.php

(it talks about asterisk, but the SIP inbound would/should work with any SIP
address).
[I dare say other providers exist, but I _know_ Gradwell do it].

--
Thomas Sandford

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"Thomas Sandford" <${thomas/03$}@paradisegreen.co.uk> wrote
in message news:440da03c$0$1168$5a6aecb4@news.aaisp.net.uk
> "Ivor Jones" <ivor@despammed.invalid> wrote in message
> news:475bbmFdooa3U1@individual.net...

[snip]
 
>
> Ah - right - I do see the distinction (though I'm not
> convinced that the OP wasn't asking the wring question in
> that case!). Gradwell _do_ provide the type of forwarding
> you refer to:
> http://www.gradwell.com/voip/asterisk.php
>
> (it talks about asterisk, but the SIP inbound
> would/should work with any SIP address).
> [I dare say other providers exist, but I _know_ Gradwell
> do it].

Thanks, I hadn't spotted that.  Pity there isn't a free one like ipkall
though ;-)

Ivor

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